PDF malware analysis — malicious · 5063832e23d93bc2

MALICIOUS

PDF

78.1 KB Created: 2021-02-23 20:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27

MD5: bf20ef216157f46d885d9cb5a81eff56 SHA-1: 0da419069fb01c85df162767e2d70f245bc64c50 SHA-256: 5063832e23d93bc2656e2deec73d7a715c63e3bcd8fd071e8110430b5db58aaa

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or SEO spam campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://maypoin.ru/wix?keyword=st205%252F75d15+vs+st205%252F75r15 PDF link annotation
- https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/mafodakawik.pdfIn PDF document text
- https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/tifelesosuro.pdfIn PDF document text
- http://topcreditscore.info/phoenix_wright_cornered_piano_sheet_musicz37fa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4479673/normal_5fda62fddb6f1.pdfIn PDF document text
- https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/e0da3e8b385982.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413239/normal_602055b4e2c74.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4387035/normal_5ff256dc2f652.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4503309/normal_602c7a999ac7e.pdfIn PDF document text
- http://nyvelsets.online/formal_definition_of_absorbancenb9ad.pdfIn PDF document text
- http://bogplaktnc.fun/baseball_jersey_templatekpopd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4477401/normal_602cb03887755.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4404103/normal_5fd1cdb5e8944.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4461780/normal_601bc3bfea4cf.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368228/normal_600473f927a34.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445114/normal_5fd2dd8358f7c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4451754/normal_5ff9c0380887b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4470962/normal_5ff32e8e5c67e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4391326/normal_5ff3305296a6a.pdfIn PDF document text
- http://discount50it.pro/44289110040a1c53.pdfIn PDF document text
- http://oneitstore.info/julitufetatujuw3f8za.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dea9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEA9	4712 bytes
SHA-256: `55c0132d03af3f4495242a7175b3528643a646942046137b6a1e43f5598a4d25`
`font_01_sfnt_off0000eec4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEC4	14000 bytes
SHA-256: `5c81ce6112db63fe0dd79dbf5796dae74b621b7ddd502a4aead8933ac52bd6de`
`font_02_sfnt_off00011b82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B82	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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